_____ the difference between the two research findings will be one of the worst mistakes you make.
| A．Ignore | B．Ignoring |
| C．Ignored | D．Having ignored |
18．After you have used the dictionary，please just put it back_________it belongs．
| A．to whom | B．to which | C．what | D．Where |
17．Now, boys，I’ll_________the story where I stopped yesterday．
| A．take over | B．take on | C．take in | D．take up |
16．It is usually not quite cold in this area in March，but sometimes temperature_______low．
| A．should | B．must | C．can | D．Shall |
15．Jack was once a common name，___________,I think, that is seldom chosen nowadays．
| A．it | B．one | C．who | D．Which |
14．-The weather isn’t good enough for an outing，is it?
-To much dust．We can’t have__________at this time of the year．
| A．a worse day | B．a worst day | C．a nicer day | D．a best day |